open mail for "send to friend"

You can do it like this:

 Application.OpenURL("mailto:user@outlook.com?subject=Subject Goes here...&body=Content goes here%0D%0Avisit http://www.mywebsite.com");

The only problem I have and I can't get it done is to make the link within the email body as text e.g. Our Website (but it will link to http://www.mywebsite.com). I don't really think its possible with the mailto: though.

You could use the mailto:// protocol and OpenURL with should be registered by default on all operating systems. This will open the default email program of the user. See Wikipedia for a short introduction. If you just want to send a predefined mail that nobody can edit you would have to maintain your own email server.